Grinding disc

Abstract

Abrasive discs with spaced portions removed from the circumference in the form of rounded and elongated V-shapes provide, when in use, complete vision of a workpiece being abraded with reduced tendency to snag on obstructions.

What is claimed is: 
     
       1. An abrasive disc having a generally circular configuration with a design direction of rotation when in use, said disc having from 3 to 9 spaced portions removed from the circumference of the disc each such portion having leading and trailing edges defined with respect to the design direction of rotation of the disc, and a length defined by the circumferential distance between the points at which the leading and trailing edges meet the circumference, wherein the deepest radial penetration of the removed portion of the disc occurs adjacent the leading edge of each removed portion and is sufficient to permit continuous vision through at least the peripheral regions of the disc and wherein the leading and trailing edges of each removed portion meet the circumference in rounded angles. 
     
     
       2. An abrasive disc according to claim 1 in which, for each removed portion, the leading and trailing edges meet the circumference of the disc at points separated by a circumferential distance X wherein X is less than one sixth of the circumference of the disc, and the disc has a shortest radial dimension on a radius that intersects with the circumference at a point that is less than one third of the distance X from the point at which the leading edge meets the circumference. 
     
     
       3. An abrasive disc according to claim 1 in which the number of portions removed from the circumference of the disc is three. 
     
     
       4. An abrasive disc according to claim 1 in which the disc is provided with holes located between the portions removed from the circumference and at a radial distance form the center of the disc that is less than the shortest radial dimension of the disc. 
     
     
       5. An abrasive disc according to claim 4 in which the holes are located so as to provide that, in use, the combined effect of the holes and the removed portions from the circumference is to permit continuous vision through at least half of the radius of the disc.